Quick answer: Complete the Green Tower key route and use its finished key at the chairlift lock. Riding the chairlift unlocks the official Big Sit achievement.
Find the main station beside the Green Tower
The two-player walkthrough records the Green Tower around 3930, 1900 and the chairlift station around 3950, 1950. The station is close enough to see from the tower: look for a blue shelter, red floor, lift supports and an empty key slot.
The activation prerequisite
Install five ordinary puzzle rewards at the Green Tower, take the gold key and follow five cutter arrows around the mountain path and station supports. An independent three-player video corroborates the same reward-to-key-to-chairlift sequence. The detailed puzzle choices are omitted here to preserve a clear search boundary.
Insert the finished key and board
Use the shaped key inside the station. The captured route shows the chairs beginning to move immediately. Wait for a seat to enter the boarding area, step onto it and remain seated through the line; the system follows a fixed aerial connection rather than a free-choice fast-travel menu.
Big Sit and Big Climb are different goals
Steam defines Big Sit as “Ride the chairlift,” so no tower-completion percentage or full circuit is listed in the requirement. Big Climb instead says “Reach the highest point.” A separate captured trophy route uses the activated chairlift as the approach to the mountain and then climbs from the drop-off, which makes the lift useful but not itself the Big Climb trigger.
| Achievement | Official visible requirement | What the evidence shows |
|---|---|---|
| Big Sit | Ride the chairlift | Board the activated lift |
| Big Climb | Reach the highest point | One captured route rides up, then continues on foot |
Keep carried objects clear of the seat
Community clips show that players can bring large puzzle objects onto the moving chair, but they can also catch under the seat or continue around the turnaround. Treat the boarding platform as a hand-off point: have one player manage the object and drop it clear of the seat before the chair reverses.
Sources
Captured 2-player and 3-player routes + official achievements · Last fact-check: Aug 11, 2026. See our editorial and corrections policy.
- Captured routeScreen Hype — Chairlift routecaptured two-player Green Tower route and coordinates
- Captured routeMaybe Sarisa Green Tower co-op routethree-player visual corroboration for the Green key and chairlift
- OfficialOfficial Steam achievementsachievement names and visible requirements
- Captured routeMain Wave Gaming — Big Climb routevisual route from activated chairlift to the highest-point climb; unrelated platform text in the upload was not used
- player reports about dropping a carried object before the chair turns